Preheat oven to 325 F. Grease a 9×13 baking dish thoroughly or spray with nonstick spray.

In a small bowl, beat eggs and vanilla and set aside. In a double boiler, add butter, cocoa, sugar and salt. Mix until the mixture becomes a batter – this will take approximately 10 minutes and at first will just look like clumps of cocoa power. Be patient! Remove the bowl from heat and whisk in the egg mixture (very slowly while whisking, so you don’t have scrambled eggs!) until combined. Stir in flour until batter is smooth, then pour in baking dish. Use a 9×13 dish for thin bars, and an 8×8 for thicker bars. For 9×13 dish, bake for 12-13 minutes. For an 8×8 dish, bake for about 18-20 minutes. Remove from oven and let cool completely! Then make pumpkin layer.

Preheat oven to 425 degrees F.

In a bowl, whisk together sugars and egg until smooth. Add in pumpkin and spice, again mixing until combine. Finish by adding in heavy cream, stirring until everything is mixed, then pour on top of the cooled brownie layer and spread evenly with a spatula. Bake for 10 minutes (9×13 dish) or 15 minutes (8×8 dish), then reduce heat to 325 degrees F and bake for 18-20 minutes (9×13 dish)/22-25 minutes (8x8dish) or until pumpkin layer is set. Let cool completely (ideally overnight, or about 3-4 hours) then slice and serve.